article: Mr. Smith is one of my friends. He can run very fast and he is always ready to show  how fast he can run.
  One day a thief  breaks into his house,takes some things of his and runs off as fast as he can. Mr. Smith runs after him and shouts :"Stop! Stop! Don't you know you can't run away from me?"
  But the thief only runs faster. Mr. Smith gets angry. He tries his best to run. He is soon a few miles away from his house. He doesn't see anything or anybody and is still rushing  alone  when he runs into  me.
  "Why are you in such a hurry?"
  "I'm trying to catch a thief."
  "But where is the thief?" I ask.
  "Far, far behind me," says Mr. Smith with a smile on his face.
  "He thinks he can run faster than me,but you see he is wrong."
question: Mr. Smith gets angry because the thief   _  .
options: stops runs away doesn't stop runs into him